Computing-scale-illuminating device.



C. B. LONGSTRETH. COMPUTING SCALE ILLUMINATING-DEVIGB. APPLICATION FILED JAN.4,1909.

1,1 05,806- Vwanted Aug` 4,1914,

' net to open the switch in the main l:

UNIT

light up the scale, particularly the reading portion thereof, when the scale is used for weighing operations.

It has heretofore been proposed to automatically illuminate such a scale by the movements of certain portions.: oi the scale itself', such as the scale lever. rihe control of such illumination by movable parts or" the scale must be such as in no way te interfere with the weighing accuracy ot' the scale. In my" proposed improvements7 l utilize electric lamp for illumination purposes, and instead of controlling this lamp circuit rectly by the movable parts oit the scale5 l control it-by means of an auxiliary circuit. This auxiliary circuit can be Very viral( as compared with the strength of the main lamp circuit, which will beadvantageous for securing the proper control by the scale lever. Furthermore, l have so arranged my auxiliary circuit, with relation to the lamp circuit, that there is absolutely no connection between the scale and the circuit controlling devices during, the weighing movements of the scale lever. The sole connections of this sort are so located as to be enygaged only when the scale lever is in normal zero position or is traveling beyond the range of its weighing positions. That in my present improvements, the sale lever when in normal zero positioin closes an aux iliary circuit which operates through a mag@ np circuit so as to prevent the lamp circni 'from being lighted; when7 however, the scale lever moves away from zero position, this in* stantly breaks the auxiliary circuit and ailows the switch in the main lamp circuit to close, which thereupon lights and illuminates the scale.

With this general description ot' the object and purposes of ray invention, twill new dessi-ibs the details 'ionwith reierence to t i ugs igure l represents side vier' iv scale showina 'the 'electric eo i u coi "l e is connected by suitable means, not shown hei i, .volving eliart carried in the drinn casing 14.-. in electric lamp 15, situated in the' end of this casing, serves to illuminste the drum and assist inthe reading ot the computing figures. Leading mfrom this lamp is a connecting wire 16 which connects/with the main wireA 17 of the line circuit silpplying` the electric current to the lamp. The other wire 18 from the lamp 15 leads to a switch for this lamp circuit. This switch comprises the movable Contact arm 20 and the stationary Contact point 2l. The arm Q0 is normally spring-drawn by the spring Q2 into Contact closingi position so as to close the main rircut and illuminate'the lamp The is also provided however an auxiliary circuit in 'which is included a magnet or s oid 3G which acts upon the movable con ua: arm and draws it against a stop pin if to hold the contact arm against its sprinw tension? and thus holds the lamp cil-ruit. o Y @ne of the wires from this solenoid 3() leads to the small battery 3l and thence ny the lead wire 32 to the Contact de vice which will presently be described. The other wire i523 leading from the solenoid 30 leads to the other side of said Contact device. This Contact device is suitably mounted at the rear ot the scale so as to .l about .the pivotal point 13. riChis saaie lever pemgiit s Contact de- Bv und 45, seated. in seid s and connected by slik threads; uitahie ineens i0 sind Contact' theseeoiiteet trips mty be drazvn to# i each ether' le each ethei tne l e inte @ropes eenteet multim@` po ion with the eentaet dosing pin 13.; ieee aie such serews end. threads both e@ f 'wp ahnd betten of these contact strips? so es to enect the Contact eetween the pin e3; isf-id4 Strips during the entii'e tizzveif nin therebetween. These silk threads' piste L -i*d mounted upen side;

.Se 5 i and down in the bottom phj; 5i end is then adjustable ver-I e tieeiijgf' by Ineens of the set screw 52 Whichj eiefvs ith-anime 42 downward 'against thei ion 'ei the sprine 58.

'4 se devices is esfohi ediusel 'so that itf :nits in dosing the iethejn sprin t me sez-ew 2L thee eiseeitnnd ilimnirieb@ that there? interfered with' as "little femme@ evice Whiehl len ane isn wiiie the seele weighing ne only when t. eV

, f ating; ebn'e this :ce1-o position,- thzit 1m Vend the range of its weighing p97 siiens, l. cenit-set strips 40' ind 4l indA eontiet z'f'esine pin i3, fue se made that there but wry 'ht fr' .ionei gentech "between the parts pttctibaiiyfnpmetfiel suse ie interi .fithjrthe'free movement o1 the scale ie'i'e Even if tlfie #ht extent, this he e. meterlo,

e f ,e Y

that sum inte! of the isnt enfer: taking place beyond the range ofneghing mmf@- ments of the iever; anw Weuh merel-y serve es :i :fight ihnnpening eiect un theoseiiiritiene n'iheut in' :my Wen' intei'eringlwith the ecn-mnejf el the Sonie. 'Jihewise it fippeme {iwan-1 'this construction that the s v-iteh fue closing the mein ,ifnnp'ciieuitmuy be i0'- e: teil. nl; any 'desired pointettmhe"tta-the fmznewnk oi ihe seeie er seme distance therefrom where there .vouldhehho iihjelil hoed ef injumis eii'ects upon 'the se'eie fi'om the sparking produced by the nieking'and breaking o' the mein circuit. Tiejauxiiiary circuit is ai 'very Week one se (leieteifms effect on the seele 'peits ey bein? munie and breiten :n1-d may he of such sum i Si enggth tha it 7-iliexhaust they betten" 3l im' elim-xg ti even theng'l'i this auirlb 'sev Circuit reinen leiesed whie the seule` is not in use. l f

l The contest strips 420 and 41 are displaced or moveiienye very slight extent by the centeet pin fwhen Contact is made :is just desciibefigV this siight displacement remains ini'ogm end is not augmented as the seele lever neve's'up eu down over the range of Contact making' ploeitinn. That is,` the displacement' is not Iineneesed er Avaried upen the continued 'extent ofi movement of the lever. These @unmet devices are dstinetive in that they eeetuete' en even pressure-'on the movable seele element irrespeethje of the location of the lever iriits path-0f travel. There is a lside thrust of the strips and 41 upon' the seele lever et iight angel's' to its direction of movement,*suiieiently to ineke 'the Contact, and the two opposite side thrusts beence each other when adjusted, whereby not to for'ee the seae levez' to oneside 'or the utile:- ent (if itsproper iine' of tmvei. These 'are schied advantages in :1. "device of this sort inzpiving movebie seele eement' wherein accuracy demands that the.' scale element be n as passible' iindnot vmiebie extents 01 iriunder unterteilen? 'iuences n i? 5 iefslewn s ,modificatien of the eenteet ems evite the euxihary cir that it has no scale 'pans me 1 whereby dm3 ime open. 45 2. Thebombimt 56 cuit incudng said hmm sw' u device in said auxin' 61mm' connec with on Whsemf .2a. liary circuit sul-. if; said Contact {ie-vice tive 4:0 sal@ scae "ie 60 becomes Se'pnlnt to open the -xgpon the scavi@ eve moving;

zero position The comb'na l electric illuminating for adjustingthe scid Contact strips relative to each other toceliect greater or less bearing pressure upon the said Contact closer slidingtherebetween.

(i. ll e combination with u weighing scale, including n niovuble sczile element, of un electric illuiniiiatingl lump for tlie scale, and f :i circuit for said lmnp; u contact device lieving connections for controlling the lamp illuminating circuit and comprising spaced contact strips; sind ai conducting pin carried by said movable scale element for engaging sziid contact strips und forming Dart o "be circuit thereof to cstublisli c rent tliioug'li the contact device.

'i'. The combination wit1 :i ive: f including` s movable seule element, ci en lamp for tlio seele, und u circuit -for Suid lamp; i c(intact-controlling lmember carried by scid movable scale eleinentzind insulated therefrom g und zi contact device having n separate circuit with means included therein for controlling` tlie lump circuit and cooperating witli seid contactcontrolling` member, suid device und said member beingrelatively constructed and located. to produce uniform Contact pressure therebetween over tlie complete range oi" Contact iiiovement.l i

8. @The combination with s weighing scale9 including,` ai movable scale element, un electric illuminating .lamp for tlie seele, and n circuit for scid lamp; n coiitectcontrolling member carried by said movable seele element und insulated therefromi1 and u contact device having s separate circuit with means included therein for controlling-the lamp circuit and having n side tlirust against said contact-controlling member over its range of contactmaiing positions.

9. rlllie combination ivitl'i e Weighing scale, including :i movable scale element, oi? :inl

lscale element;

'forth in tbe iiiosoa electric illumineting lamp for the scale, and' n circuit for suicl lamp a contact-controlling` said movable scale= ele# member carried, by

merit; sind ,it duplex Contactl devicehavi connections for controlling the lampcircuit and exerting contiict pressure on opposite l0. The combination with n weigliin scale., including :i movable scale elementl o :in `electric illumina-tinp.lump-for the scale,v

`and :i circuit for said` am si, contact-con'- trolling1 member carried y said y'movable scale clement; a duplex'contzict device hav' ing` connections cuit und exerting Contact pressure on opposite sides of scid contfict-controllingmember over its range of contact-making positions; and means for udjusting scid contact device to vitry the lateral contact contact-controlling iiienibci.

l1. The combination with a Weigliiii scale, including n movable scale element,V 0% an electric illuminating lamp for the scale, zuid-r, circuit for said lain); :i Contact controlling); member carried y said movable n inovablepliite cariyin a pair of confronting contact strips pressing laterally upon onpcsite sides of said contact controllingr member, andsiiid stri s having connectionsA for controlling said am cirl cuit; ineens for moving said plate bac and to vary the time of contacting of tlicsziid direction ol said contact strips oicontrolling the lump ciry,

pressure on said z contact controlling member with said strips.

in testiinon f whereof I alix my signature iii tlie presence of tivo subscribing Witnesses.

ciiiiiiiiiis B. iioNGsTRETH, 1

"Witnesses Lines, lfiniiniiioiin ll. TURNER. 

